<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    .page {
      font-size: 0;
      height: 200px;
    }

    .left,
    .right {
      height: 200px;
      width: 200px;
      background-color: #0ce130;
    }

    .content {
      height: 200px;
      background-color: #e0c230;
      width: calc(100vw - 400px);
    }
  </style>
  <body>
    <div class="page">
      <div class="content">
        <div class="inner">主要内容</div>
      </div>
      <div class="left">广告位</div>
      <div class="right">广告位</div>
    </div>
  </body>
</html>
